Functional Alcoholic

We PCed a guy the other night who was banging on a friends door looking for some action. He was wasted but talking and walking. He refused the breath test when we took him in at 1:00 am. Come the morning at about 7:00 am we told him if he blew below .05 he could go, in my mind he looked and was acting sober enough. He took the test (mind you this is 6 hours later) and still blew a .19! Man talk about looks can be decieveing. Not to mention 58 on the BOP and revoked license for 10 years (5th Offense OUI). Anyone have similar experiences with functional alcoholics?